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Suppose it is desired to estimate the average time a customer spends in a particular store...

Suppose it is desired to estimate the average time a customer spends in a particular store to within 5 minutes with 99% confidence. It is estimated that the range of the times a customer spends in the store is 90 minutes. How large a sample should be taken to get the desired interval? Right-click the link to use this Z table
(The answer is NOT 135, or 134.37) (I believe the standard deviation is not 22.5)

The answer is 60, you're welcome

math   Statistics-And-Probability   
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Answer #1

If the sample size n is small then range/4 is the best estimator for the standard deviation

If the sampel size n is large then range/6 is the best estimator for the standard deviation

Now, SD = Range / 6 = 90/4 = 15

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